Blue dyes of the anthraquinone series.



ITED STATES V PATENT OFFICE...

l WILI-IELM HERZBERG, OF WILMERSDORF, AND GERHARD HOPIPE. BF T'itEP'iTOW, GER- MANY, ASSIGNORS 'IO ACTIEN GESELL$CHAFT FTTB ANILIN FATBBIKATION, 0]?

BERLIN, GERMANY.

BLUE DYES OF THE ANTHRA-QUTNONE SERIES.

Specification of Letters Patent. Application filed December 23, 1912. SeriaLNo. 738,3(38.

measles.

No Drawing.

, of the Anthraquiuone Series, of which the following is a specifieathm.

The present invention relates to themanufactui'e of new dyes which dye wool from an acid bath blue shades fast to light. These dyes are 1A diamino derivatives of anthraquinone-Q-carboxylic acid and correspond to the general iorn'iula:

- molecule.

, The unsulionatcd dyes are, generally speaking, dark compounds, diflicultly soluble. in water, but. easily soluble with a blue colorin alcohol, glacial acetic acid, hot intro-bcnzene, afllialis. Their solution in sulfuric acid of (30",) strengthis ln'oWuish-red, in sulfuric acid of 1003 strength brownish to olive, in oleum (i. c. fuming sulfuric acid) green-blue. They form brown-red. siilfatcs, which are dissociated by water. They dye wool from a bath containing acetic acid blue.

The dyes containing sulionic groups are blue powders, soluble with a blue'color in water, alkalis, hotalcohol, glacial acetic acid. Their aqueoussolution becomes red by addition of a great proportion of a mineral acid. They are dissolved by a mixture of oleum and boric acid, yielding blue solu-' tions; sulfuric acid of strength dis solves to red solutions. They dye wool from an acid bath blue. The shades of the specified colorations de- Pa-tented Nov. i it .llljiifl.

pend to some extent upon the special constitution of the dyes, the blue being more or less greenish. The unsulitonated compounds are obtainable for instance by reacting with anmumia or a primary amin on Lamina l halogen anthraquinone carboxylic acid. They are even formed by condensing amino #5 acidylamino l earboxy-benzoylorthohenzoic acid, 2.5 diaminobenzoyl lcarboxy-benzoyl-ortho-benzoie acid or its lactam with dehydrating agents.

' The introduction of sulifonie groups may be executed in any phase o'fihe prodnctimi of the dyes; If the condensationot the de l'ivativesof benzoylbenzoic acid is performed by heating with sulfuric acid, it is possible to combine this operation with the sult'onation.

The following examples, the parts being; by Weight, illustrate how the dyes may be produced.

Example 1: 30 parts of l-aminml-chlcroanthraquinom-Q-carboxylic acid are heated in an autoclave for 6 hours at 100 C. with 100 parts of ammonia (20%), 15 parts of calcined sodium carbonate and part of crystallized cupric sulfate. From the blue solution the 1.eL-diamino-anthrnquinone-2- carboxylie acid is separated by an acid. crystallized from alcohol it shows dark blue needles, melting at about 350 its solution in alcohol, glacial acetic acid. hot nitro benzene, alkalis is bright blue. .lts sulfate Example 2: 30 parts of 1-ttH1l110--l(.'-lll()- roai'lthraquinoiie-2-earboxylic acid are boiled for 20 hours in a reflux apparatus with 300 parts of water, 30 parts of -l;-toluidin, 15

parts of calcined sodium carbonate and 1 part of crystallized cupric sulfate. lily acidifying the blue solution the l-aminol parl tolylaminoanthraq11iinme-2-earboxylie acid is separated. tecrystallized from nitrobenzene it is a dark erystahpowder with a violet reflex, melting at. about 285 0. Its solution in alcohol, glacial acetic acid, hot nitrobenzcnc, alkalis is greenish-blue.

Example 3: 1. part of 2-amino-5-acetylamino A} carboxy benzoyl-ortho-benzoie acid, obtainable for instance from 2-nitro-5-acetyl amino 4 methylbenzoyl-ortho-benzoic acid by OXltlatiOIfWltll permanganate and reduction of the nitro group, is heat-ed for a short time at 190 C. with 6 parts of sulfuric acid the mass into A-diaminoan- 3 30116 2 'ZPiEOKIY lic separates in sh-red needles. ihe a-e filtered and with \"F2l cQI',-Wl'll'6l)y thesulfate is olyzed. The 1. ;-dianiinoanthraqui- "arbot-zylic acid remains in pure state. Example i: 1 part of the 2.5-diamino-lcarbcxybenaoylortho-benzoic acid or its lactam. (obtained by heating 2amino-5- acidylainino-elcaiboxy benzoyl-ortho 7 benzoic acid with sulfuric acid. of strength) is heated at 190 C. with a solution of 1 part of anhvdrous boric acid in 6 parts of oleum containing 5% 80,. After a suorttime the temperature is lowered to 130-14-0 C. and 1 part of olenm containing of S0,,

(in pourin,

is added riter one hour the mass is poured into ice-water, whereupon the sulfate of the sulionic acid separates t dissolves easily water to a blue solution, -frorn which the 1.l-disininonnthraquinone-sulfo-iq carbo- Kylie acic salted out.

Example 5: 1 part of IA-diaminoanthraquinone-2-carboxylic acid is heated at 130 a mixture of 8 parts ofoleum containing 20% SO, and 1 part boric acid, until a productis obtained, which is easily soluble Then the mass is poured on ice salted out.

c claim is,- i

products, the bluedyes being inerivatives of anthr'aquinone-Q- acid and having the general well iii-canine" a univalent radical), which are i to brownish to olive, in

n'nieh-red, in sulfuric acid,

oleum to a green-blue solution, Iormin'g brownred sulfates, which are dissociated by water; in the sulionated state being, generally speaking, bluepowders, soluble with a blue color in water, alkalis, hot alcohol,

' glacial acetic acid, the aqueous solutions becoming red by addition of a great proportion of a mineral acid; being dissolved from a mixture of oleuni and boric acid to a blue solution, from sulfuric acid of 60% strength to a red solution; dyeing'wo'ol froni an acid bath blue sh des.

2. As a newproduchthe blue dye, in the unsulionated state being the 1-amino-4-paratolylamino-anthraquinonc-Q-carboxylic acid:

adark powder with a 'VlOlEt reflex, difiicultly soluble in Water, but soluble with a 9 blue color in alcohol, glacial acetic acid, hot nitrobenzene, alkalis; soluble in sulfuric acidof 60% strength to. a brownish-red, in'- sulfuric acid of 100% strength to an olive, in oleuin to a green-blue solution, forming a brown-red sulfate, which is dissociated by water; in the sulfonated state being a green-. blue powder, soluble with a green-blue color in water} alkalis, hot alcohol, glacialacetic acid, the aqueous solutions, becoming red by addition of agreat proportion of 'a mineral acid, being dissolved from a 'mixture of oleur'n and boric acid to a blue solution, from sulfuric acid of 60% strengthito a red s'o1u tion; dyeing wool from an acid bath greenish-blue shades.

In testimony whereof we have hereunto set ourhands in presence of two subscribingwitnesses. v i

WILHEI-JMLH-ERZBEBG.

' HOPPE.

TVitnesses v HENRY HAsPER,

' JVOLDEMAP, HAM. 

